Recovery treatment method for wastewater containing organic matters

Abstract

The invention provides a recovery treatment method for wastewater containing organic matters. The recovery treatment method comprises: S1: adjusting the pH value of wastewater containing organic matters to less than 3, and treating the wastewater containing organic matters by using a carbonate and/or a basic carbonate to obtain a treated mixture; and S2: recovering the organic matters from the treated mixture so as to obtain the purified wastewater. According to the present invention, the wastewater containing organic matters is treated with the cheap carbonate and/or the basic carbonate, the hydrogen ions in the wastewater containing organic matters and the carbonate and/or the basic carbonate are subjected to the reaction to generate carbon dioxide gas, and the organic matters in the wastewater are carried away, such that the deep removal and the recycling of the organic matters in the wastewater can be achieved so as to achieve the low-cost recycling or the standard discharging of the wastewater.

Description

technical field [0001] The invention relates to the field of recovery and treatment of petroleum, chemical and metallurgical wastewater, in particular to a method for recovery and treatment of wastewater containing organic matter. Background technique [0002] Wastewater containing organic matter comes from a wide range of polluted wastewater produced in petroleum, chemical, metal smelting and other production activities, which contains lipids (fatty acids, soaps, fats, waxes, etc.), alkanes and mineral oils, animal and vegetable oils, etc. , generally exist in the water body in the form of suspended state, dispersed state, emulsified state and dissolved state (the difference between the classification of these organic substances is mainly that the organic substances exist in different states in the water, and the particle size of the organic substances gradually decreases). [0003] Due to different processes and products in the petroleum and chemical industries, there are ...

AI Technical Summary

Problems solved by technology

During the extraction process, the organic extractant enters the wastewater mainly through chemical dissolution and physical entrainment, which not only causes the wastewater to contain a certain amount of organic matter, resulting in excessive COD and organic matter, but also causes the loss of the organic extractant

Especially the wastewater generated during metal extraction enrichment and / or separation process, due to entraining a small amount of extractant (such as P507, P204, N235, C272, TBP, T350, etc.) and organic phases such as kerosene, this part of wastewater is discharged directly Or recycling will cause loss of organic matter and excessive COD, which will have a serious impact on production and the ecological environment

[0005] At present, the treatment methods commonly used for wastewater containing organic matter include: static method, oil separation adsorption method, ultrasonic flotation method and other physical methods, generally only remove the entrained organic matter, and the colloidal and dissolved organic matter need to use lime Chemical methods such as milk neutralization and sedimentation (saponification), ozone catalytic oxidation, etc., therefore require a combination of several methods, and it is difficult to meet the standard

Moreover, the combined treatment cost of the above-mentioned multiple methods is relatively high, and the organic extractant enters the waste residue and is not effectively recovered, resulting in a large amount of organic extractant loss.

[0006] There is also research on the use of membrane technology to remove the emulsified and dissolved organic matter in the water that is uniformly and stably dispersed in the water with tiny oil droplets after the traditional flotation technology, which has the advantages of good water quality, small equipment footprint, simple, The advantage of no scum; but its disadvantages are that the membrane pores are easy to block, difficult to clean, high operating costs, and the life of the membrane is short, the cost is high, it is not suitable for large-scale treatment, and it is difficult to popularize and apply in industrial production

[0007] The above process problems lead to high consumption of organic matter in chemical and metallurgical enterprises

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